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ust	05-13-2009 05:22 AM

Output error / message to /dev/null

I have a batch job that run many commands , sometimes it generate errors ( for different reasons ) , so that there are many messages pop to the console , and write to messages log , can advise if I want the batch job DO NOT output anything or just output to /dev/null ( because there are too many messages ) , what can i do ? thx

colucix

05-13-2009 05:25 AM

Usually redirecting both the standard output and the standard error to /dev/null is enough:

Code:

/path/to/script > /dev/null 2>&1

your_shadow03

05-13-2009 05:31 AM

what does 2>&1 represent?

repo	05-13-2009 05:36 AM

http://lists.freebsd.org/pipermail/f...ay/123250.html

colucix

05-13-2009 05:45 AM

Quote:

Originally Posted by your_shadow03 (Post 3539216)

what does 2>&1 represent?

From Chapter 19 of the advanced bash scripting guide:

Code:

2>&1

      # Redirects stderr to stdout.

      # Error messages get sent to same place as standard output.

        >>filename 2>&1

            bad_command >>filename 2>&1

            # Appends both stdout and stderr to the file "filename" ...

        2>&1 | [command(s)]

            bad_command 2>&1 | awk '{print $5}'  # found

            #  Sends stderr through a pipe.

            #  |& was added to Bash 4 as an abbreviation for 2>&

            #+ but as of version 4.0 this still does not work.

chrism01

05-13-2009 08:22 PM

Note that if you are getting msgs (particularly on stderr) you should redirect to a logfile so you can fix the issues...

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